Tests were conducted to obtain optimum smelting,casting and heat treatment processes for former soviet 08ГДИФЛ material through experimental study and productive practice.The result showed that the processes for the material,i.e.smelting with electrical furnace,molding with furan resin bonded sand and adopting special heat treatment and so on,are feasible,and the quality of castings can meet the technical requirement.
The effects of water temperature on oxygen consumption rate and ammonia excretion rate of Solenaia oleivora were studied in the laboratory. The results showed that, under controlled conditions and ambient temperatures 15-30℃, the relationship between oxygen consumption rate (O) [mg/h] and dry weight of soft tissue (W) [g] can be represented by an allometric equationO=aW(superscript b), while the relationship between ammonia excretion rate (N) [μg/h] and dry weight of soft tissue (W) [g] follows also an allometric equation N=cW(superscript b). It is indicated that both metabolic rates are correlated positively with water temperature. High temperature can reduce the level of protein metabolism. The linear regression among oxygen consumption rate (O), temperature (T) and dry weight of soft tissue (W) can be described by the equation 0=-0.6513+0.0532T+0.1073W, and for ammonia this relation is N=32.1626-1.0566T+1.3222W, the multiple relation coefficient was 0.9642 and 0.8921, respectively.
Water purification experiments were conducted in a media-sieve embankment(MSE)with zeolite barrier,in the Taohuajiang river,in the city of Guilin.Fluctuation of the water table on both sides of the MSE promoted water purification by way of a biogeochemical process.Average removal rates of COD,NH+4-N and TN in the MSE were 76.5%,95% and 81%,respectively.The concentration of COD gradually decreased from outside to inside in the MSE.In the tested zeolite barrier,about 2.5 m away from the bank the concentration of COD was close to 5 mg·L-1.Concentrations of NH+4-N in the fifth and sixth layers were stabilized at 0.3 mg·L-1.An effective thickness(10 cm)of the zeolite barrier could adsorb NH+4-N completely and meet the requirement of river-water purification.
The current study aimed to evaluate the impact of clinically relevant concentrations of dexmedetomidine on the deformability of erythrocytes in vitro and the effects of dexmedetomidine on the deformability of erythrocytes in patients undergoing laparoscopic cholecystectomy. Erythrocyte suspensions of different concentrations were divided into six groups: Control (group C); low, medium and high concentrations of dexmedetomidine (groups DL, DM and DH, respectively); yohimbine alone (group Y) and yohimbine mixed with dexmedetomidine (group YD). The suspensions were incubated in a thermostatic shaking incubator (50 rpm, 37˚C) for 60 min. The nitric oxide (NO) concentrations and endothelial nitric oxide synthase (eNOS) activities of red blood cells and the erythrocyte deformability index (EI) were then measured. Patients (n=40) scheduled for laparoscopic cholecystectomy were randomly divided into a dexmedetomidine group (group A) and a control group (group B). The induction and maintenance of anesthesia in the two groups was identical. The EI and hematocrit (Hct) were assayed prior to anesthesia (T0) and following the surgery (T1). In the in vitro assay, the EI, the activity of eNOS and the NO concentration of the erythrocytes were significantly higher in groups DL, DM, DH and YD than in group C (P<0.05). In addition, the EI, the eNOS activity and NO concentration of the erythrocytes were higher in group DM than in group YD (P<0.05). In the patients, the EI value at T1 (0.90±0.04) was higher than at T0 (0.81±0.06) in group B (P<0.05). No statistically significant difference between the EI values at T0 and T1 was identified in group A (P>0.05). Dexmedetomidine treatment is able to improve the deformability of erythrocytes in vitro and in anesthesia. The improvement of erythrocyte deformability by dexmedetomidine may be partially associated with adrenergic receptors through activation of eNOS to enhance the concentration of NO in red blood cells.
A series of hydroxylated polystyrene (PS-OH) resins were prepared from macroporous poly(styrene-co-divinylbenzene) by nitration, reductive amination, diazotation and hydrolysis in sequence, and then a series of hyper-cross-linked hydroxylated polystyrene (HCPS-OH) resins were successfully prepared from the PS-OH resins by the Friedel-Crafts post-cross-linking using dichloromethane as an external cross-linker. Benefiting from the synthetic protocol, the HCPS-OH resins showed better adsorption performance for methylene blue in aqueous solution as compared with the corresponding PS-OH resins. HCPS-OH-4, one of the fabricated HCPS-OH resins which had the hydroxyl content of 5.0 mmol g-1 and BET specific surface area of 69.0 m2 g-1, showed the highest adsorption capacity and selectivity for methylene blue. Higher temperature, higher pH, and higher ionic strength were beneficial to adsorption of methylene blue from aqueous solution. HCPS-OH-4 could be regenerated by treatment with 1.0 M HCl methanol solution and deionized water sequentially. Moreover, HCPS-OH-4 retained good adsorption performance for methylene blue even after 5 cycles of adsorption and regeneration, which implied that it was a good candidate for adsorptive removal of methylene blue dye in waste water.
Crosslinking-coloration could undertake between iridoids and amine-containing compounds,and this dyeing mechanism is basically different with all of those dyestuffs practiced at present.In this paper,three sulfur-containing iridoids were prepared from Paederia scandens(Lour) Merrill(Rubiaceae),the reaction condition and the color-forming mechanism of iridoids with amine-containing compounds were investigated.The results indicated that:(1)For these sulfur-containing iridoid glycosides,enzymatic hydrolysis and color-forming reaction with methylamine could and must be carried out in one solution simultaneously.Further more,even without the presence of β-glucosidase,color-forming reaction could undertake between methylamine and paederoside or paederosidic acid methyl ester under mild acidic or basic solution.(2) The resultant color formed by each iridoid glycoside reacting with BSA and each protein fiber(e.g.,hide powder,silk and white hair) was the same as that formed by each iridoid glycoside reacting with methylamine.The result confirmed that,the molecular structure of iridoid compounds was the dominate factor for the resultant's color.(3) The mechanism of this color-forming reaction might be that,the presence of methylamine had a cooperative effect with β-glucosidase,sulfur-containing iridoid glycosides were transferred to color-intermediates,then the intermediates were polymerized to form colorants.
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
'/%3e%3cuse xlink:href='%23a' transform='rotate(23.036 .093 25.536)'/%3e%3cuse xlink:href='%23a' transform='rotate(45.87 1.273 16.18)'/%3e%3cuse xlink:href='%23a' transform='rotate(69.945 .996 12.078)'/%3e%3cuse xlink:href='%23a' transform='rotate(20.66 -19.689 31.932)'/%3e%3c/svg%3e)